Upper row: cumulative mass of accreted gas as a function of time for three isolated models of different initial spin: a) shows accretion into 30 kpc sphere and b) shows accretion into the disk region with R< 30 kpc and | z | < 2 kpc. Lower panels: c) fraction of gas f_gas = M_gas/ (M_gas + M_stars) inside the disk region defined by R< 30 kpc and | z | < 2 kpc as a function of time and d) stellar mass as a function of time.